CO2 Absorber Exhaustion — FRCA Final MCQ
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Correct answer: D — Exhausted CO2 absorbent — replace canister
Rising inspired CO2 (Phase 0 not zero) = CO2 not fully removed. Most common: exhausted soda lime. Also: channelling, incompetent unidirectional valves. Colour change confirms exhaustion. Replace immediately.
Reference: RCOA – 2020 – Anaesthetic breathing systems